US1414172A - Knife and scissors sharpener - Google Patents

Description

C. W. BROWN.

KNIFE AND SCISSORS SHARPENER.

APPLICATION FILED NOV. 13. I919.

Patented Apr. 25, 1922.

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CHESTER w. BROWN, or CHICAGO, rumors.

Specification of Letters Patent.

' KNIFE AND SCISSORS SHARPENER.

Patented Apr. 2,5,

Application filed November 13, 1919. Serial No. 337,897.

To all whom it may concern Be it known that I, CHESTER W. BROWN, a citizen of the United States, residing at the city of Ohicago, in the county of Cook and State of Illinois, have invented certain new.

and useful Improvements in Knife and Scissors Sharpeners, of which the following is a specification.

My invention relates to sharpening devices for knives, scissors, and the like, in which. rotary abraslve wheels are employed anderation of moving the blade to be sharpened backward and forward in contact with the wheels, causes the wheels to rotate, and grind the edge of the knife or blade.

Another object is to provide a sharpening device wherein one element is beveled to sharpen the beveled side of edged tools, and theother element is flat, to sharpen the fiat side of the same tool.

Another object is to provide adjacent the sharpening element means for guiding and sharpening scissors and shears on the same limb of the handle have provided the guide .11 for guiding scissor and shear blades as device.

With the foregoing and other ob ects 1n view, my invention consists in the arrangement and combination of parts hereinafterdescribed and claimed, and while the invention is not restricted to the exact details of the construction disclosed, still, for the'purpose of illustrating a particular embodiment thereof, reference is had to the accompanydrawings,

ing drawings in which like reference characters designate the same parts in the several views and in which, v

Figure 1 is a section view showing the cross section and relative position of the different elements, and knife blade.

'Figure 2 is a side elevation, showing the blade of a shear in the shear sharpening guide. I

Figure 3 is an end view of'the sharpener, showing it in use in sharpening a blade beveled on one side.

Figure 4 shows a variation in which the shear guide is at theside of the handle.

Figure 5 shows another variation in whlch one portion of the shear guide is omitted. Referrin now more particularly to the have shown my sharpening device as composed of the two abrasive wheels 1 and 2, rotatably mounted upon a shaft as 3. For convenience in use'andoperation, the shaft 3 I have mounted 1n a conv'ementhandle, as the flat wire U shapedhandle 4 shown.

I have preferably made the wheel 1 in the shape of a truncated cone, with the angle to suit the angle of the toolto be sharpened as 5. The wheel 2 I have preferably made flat on one side, and on'the side adjacent to wheel 1', I have made it with a narrow rim preferably flat, with the middle portion con:

cave, to form a complement to the wheel 1.

For the purpose of holding the wheels 1 and 2 against the blade inserted between them in sharpening, I provide the spring-6 mounted upon the shaft between one of the wheels and the side of the handle. For convenience in assembling I have made the shaft 3 with a bolt head as at 7, and threaded'at its reverse end 8. On this shaft Ihave provided a thumb or win nut 9 for readily ad justing the tension 0 the spring 6 against said wheels, and I have also provided a'lock nut as 10 for holding said parts in o crating position when suitably adjusted an against accidental movement.

Mounted upon the shaft adjacent to one they are being sharpened. on'the flat side of wheel 2. 'Thlsguide consists of the portion 12, with the hole therein for reception of the shaft 3. One end is bent up slightly to form a bearing on the edge of the handle, while Figure 1 I have shown this guide as disposed within a bend of the limb of the handle, and

in Figure 4 the scissor and shear blade guide 11 is arranged at an angle to the position shown in' Figure 1, and it has its portion 12 disposed transversely of one side of the handle and its loop 13 projecting from the hendle, while in Figure 5 I have shown the guide 11 as composed of only one limb 12", the shear blade being held disposed thereagainst in sharpening. 4

- In sharpenin the .blades of butcher, kitchen, and ot er moderately sized knives which canbe inserted between the limbs o the handle, the blade isplaced between the wheels as shown in Flgure 1, and pushed backward and forward. As the blade moves 10 backward and forward the friction against the wheels causes them to revolve, and they grind the edge of the blade to the desired sharpness. In knives which are sharpened on both sides, it is best to reverse the sharpener, and employthe beveledwheel on both edges, as a better result is obtained, When it is desired to sharpen larger tools, like the knives of paper cutters and the like, and those with a bevel on only one side, the device is placed upon the edge of the blade as shown in Figure 3 with Wheel 1. on the side having the bevel, and wheel, 2 on the side not beveled, andthe sharpener is moved backward and forward lengthwise of the blade, and in this movement the friction of the knife against the wheels causes them to rotate, and thus grind the edge to the required sharpness. It will also be understood, that more or less pressure may be employed in applying the sharpener to the blade, and that. the spring tension may be adjusted to any variation of work required.

i In sharpening shears, scissors, and the like, the blade to be sharpened is inserted between the limbs of the guide 13 as shown in Figures 2 and 4, with the edge in proximity towheel 2, and the blade is moved backward and forward lengthwise of the blade, being held firmly against the flat surface of wheel 2 and thereby the edge is ground to the desired shearing angle and sharpness. When using the variation shown in Figure 5, the inside flat side of the shear blade is held against the guide to merely secure the proper angle in sharpening, and the blade-is moved forward and backward as above described. The advan tage of this variation, is that it accommodates all. sizes no matter how large or small the blade may be- Having thus described my invention, what I claim and desire to secure by Letters Patent, is the following 1. In a sharpener for knives, scissors, shears and the like, the combination of a handle, a grinding wheel mounted on said handle and'having a flat surface,'and a sub stantially U-shaped guide harried by the handle and opening adjacent the said flat surface andextending in an outward direction from the same near the perpendicular to the said flat face of the grinding wheel for guiding the blades of scissors or shears as surface of said wheel.

2. In a sharpener for knives, scissors, shears and the like, the combination of a handle, two grinding Wheels mounted upon said handle, a guide for scissors and shears they are being sharpened'upon said fiat blades separate from and supported by the handle mounted adjacent one of said wheels, sald guide having a member disposed par-.

allel the flat surface of said wheel, and a second member extending in an outward directionnear the-perpendicular to said fiat surface of said wheel, for guiding the blades

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